antique vs age-old

antique is a noun but age-old is not a noun.

Word	Noun	Adjective	Verb	Adverb
antique	Yes	Yes	Yes	No
age-old	No	Yes	No	No

As adjectives, antique and age-old are synonyms defined as:

antique (noun)	age-old (noun)
any piece of furniture or decorative object or the like produced in a former period and valuable because of its beauty or rarity
an elderly man

antique (adjective)	age-old (adjective)
made in or typical of earlier times and valued for its age	belonging to or lasting from times long ago
out of fashion
belonging to or lasting from times long ago

antique (verb)	age-old (verb)
give an antique appearance to
shop for antiques